condition mean min max ZT0-3 31.326808 31.326808 31.326808 ZT4-7 31.081573499999998 31.081573499999998 31.081573499999998 ZT8-11 35.33447 35.33447 35.33447 ZT12-15 26.5652125 26.5652125 26.5652125 ZT16-19 36.050284500000004 36.050284500000004 36.050284500000004 ZT20-23 32.108627 32.108627 32.108627